" Take a quick peek in your nearest CompUSA or Best Buy: other than the disturbing amount of hunting and street racing games being sold, notice any other trends? No, I'm not alluding to the growing number of mousepads with kittens printed on them: I'm talking portable mp3 players - every color, every shape, everywhere! I'd say that, by my precise calculations, there are at least 46 million different models to choose from right now, from almost as many companies. From the popular-yet-overpriced Apple I-Pod, to the key chain-styled offerings from I-River, there's one for everyone. For this article, I'll be giving you the skinny on the 128mb-equipped model 830 player from the good folks at "iRock!" "